Furnace.



M. M. BAIRD.

FURNACE APPLIUATION FILED OUT. 8, 1912 Patented Sept. 1, 1914.

THE NORRIS PETERS 60.. FHOTO'LITHOM WASHINGTON, D C.

MORTIMER M. BAIRD, OF ROCHESTER, NEW YORK.

v FURNACE.

Specification of Letters Patent.

Application filed October 8, 1912.

Patented Sepfii, 1914..

Serial No. 724,564.

To all whom it may concern Be it known that I, MORTIMER M. BAIRD, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to furnaces.

The primary object of the invention is to produce a maximum radiating surface with? in a minimum area, whereby a considerable amount of heat may be obtained from a relatively small furnace.

Further objects of this invention will appear as the following specific description is .read in connection with the accompanying,

drawing, which forms a part of this application, and in which Figure 1 is a side elevation. Fig. 2 is a sectional view. Fig. 3 is a horizontal sectional view on the line 33 of Fig.2. Fig. l is a similar view on the line lt of Fig. 2. Fig. 5 is a fragmentary vertical sectional view showing a connection of the air fiues with the space below the fire pot.

Referring more particularly to the drawing, 1 represents the fire box of the furnace which may be cast in one or more sections or may be constructed of sheet iron pressed into shape, as is found most desirable. Extending radially from the sides of the fire box and running vertically of the same are hollow arms 2 which extend from the lower end to a point approximately two-thirds of the height of said fire box and are closed at their lower ends. The fire box is closed by a bottom 3 and at its top by a cover or lid 4 having an annular flange 5 for a purpose to be hereinafter described. This box or fire pot is mounted in a casing 6 constructed in any suitable manner and of as many sections as is desired and closed at the top, as shown at 7, where the same is provided with hot air fiues 8 and an opening for the passage of the smoke stack 9 which leads from the fire box to the chimney.

The casing closely fits against the hollow arms and forms with the same flues 10 for the passage of the cold air from the air space 1O which receives air through the inlet pipe 11. The casing is provided with an inwardly extending annular bafiie plate l2 which coacts with the fire box and flange 5 to produce an irregular passage 13 leading into the hot air compartment 1% above the top of the fire box.

The above described furnace is preferably used in connection with a gas burner 15 which is located in the bottom of the fire pot and may be of any suitable formation.

What is claimed is In a furnace, an elongated tubular casing, a fire pot arranged therein, said casing having spaces above and below the fire pot, a cold air inlet pipeleading into the space below the fire pot, radially extending, hollow arms on the fire pot engaging the inner side of the casing and forming therewith hot air flues which communicate with the space below the fire 0t, said arms extending from the bottom 0' the fire pot to a point slightly above its longitudinal center, a removable top for the fire pot having an overhanging flange projecting toward the casing, an inwardly extending flange carried by the casing and arranged between the upper ends of said arms and the first flange and coacting with the first flange of the fire pot and casing to produce an irregular passage, said hot air flues opening into the space surrounding the fire pot and beneath the lastnamed flange, a smoke pipe connected to the fire pot, hot air fiues extending out of the top of the casing and a burner arranged in the bottom of the fire pot.

In testimony whereof I aflix my signature in presence of two witnesses.

MORTIMER M. BAIRD.

Witnesses CI-iAs. R. PInRoE, ANDREW HAMM'ERER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

